I don't know how to express the name of this design technique, but please view the images below.
This is like the "chathead" of facebook messenger, when you click on chathead, it will show a layout right at the position of chathead, and then you can interact with that application via textview or button. When you click outside the layout it will collapse to become a chathead.
(Note: it's not duplicate, I looked everywhere on the internet before decide to ask this question).